WO2009150978A1 - プラズマ処理装置及びプラズマ処理方法 - Google Patents

プラズマ処理装置及びプラズマ処理方法 Download PDF

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Publication number
WO2009150978A1
WO2009150978A1 PCT/JP2009/060158 JP2009060158W WO2009150978A1 WO 2009150978 A1 WO2009150978 A1 WO 2009150978A1 JP 2009060158 W JP2009060158 W JP 2009060158W WO 2009150978 A1 WO2009150978 A1 WO 2009150978A1
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WIPO (PCT)
Prior art keywords
coaxial waveguide
inner conductor
plasma processing
processing apparatus
coaxial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2009/060158
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English (en)
French (fr)
Japanese (ja)
Inventor
昌樹 平山
忠弘 大見
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku University NUC
Tokyo Electron Ltd
Original Assignee
Tohoku University NUC
Tokyo Electron Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Tohoku University NUC, Tokyo Electron Ltd filed Critical Tohoku University NUC
Priority to US12/997,180 priority Critical patent/US8327796B2/en
Priority to KR1020107022951A priority patent/KR101229843B1/ko
Priority to CN2009801212828A priority patent/CN102057760A/zh
Publication of WO2009150978A1 publication Critical patent/WO2009150978A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32192—Microwave generated discharge
    • H01J37/32211—Means for coupling power to the plasma
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32192—Microwave generated discharge
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/32—Gas-filled discharge tubes
    • H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
    • H01J37/32192—Microwave generated discharge
    • H01J37/32211—Means for coupling power to the plasma
    • H01J37/32229—Waveguides

Definitions

  • the present invention relates to a plasma processing apparatus and a plasma processing method for generating plasma using electromagnetic waves and performing plasma processing on an object to be processed.
  • it relates to impedance matching of transmission lines.
  • a desired microwave is transmitted to the transmission path as energy for ionizing and dissociating the gas, and is released into the processing container.
  • a plasma processing apparatus configured to provide gas passages on the ceiling surface of the processing vessel and to introduce gas from the ceiling surface into the processing vessel using the ceiling surface as a shower plate, it is at a position that does not interfere with a coaxial tube that transmits microwaves. Since the gas flow path must be provided, the thickness of the coaxial tube cannot be increased too much.
  • the dielectric plate that is provided on the ceiling surface of the processing vessel and releases the microwave transmitted through the coaxial tube into the processing vessel is thin, the uniformity of the plasma is increased, but the microwave from the plasma side is increased.
  • the characteristic impedance on the input side of the coaxial tube adjacent to the dielectric plate (the end of the coaxial tube on the microwave source side) needs to be larger than 10 to 20 ⁇ . . Therefore, in the conventional coaxial tube having the same thickness and uniform characteristic impedance along the longitudinal direction as in the prior art, the reflection of the microwave from the plasma side is large, and a large amount of power cannot be transmitted.
  • an object of the present invention is to provide a plasma processing apparatus having a coaxial tube structure having different characteristic impedances on the input side and the output side. .
  • a plasma processing apparatus that plasmas a target object by exciting a gas with an electromagnetic wave, the processing container and an electromagnetic wave source that outputs the electromagnetic wave
  • a thickness ratio between the inner conductor and the outer conductor is not uniform along the longitudinal direction, the first coaxial waveguide that transmits the electromagnetic wave output from the electromagnetic wave source, and the interior of the processing container
  • a dielectric plate that emits an electromagnetic wave transmitted through the first coaxial waveguide to the inside of the processing container, adjacent to the first coaxial waveguide.
  • the characteristic impedance of the coaxial tube changes depending on the change in the thickness ratio between the inner conductor and the outer conductor of the coaxial tube. Therefore, according to the structure of the first coaxial waveguide whose thickness ratio between the inner conductor and the outer conductor is not uniform along the longitudinal direction, the characteristic impedance of the first coaxial waveguide is uniform along the longitudinal direction. Disappear. Thereby, the characteristic impedance on the input side of the first coaxial waveguide and the characteristic impedance on the output side of the first coaxial waveguide can be made different.
  • the ratio of the thickness of the inner conductor and the outer conductor of the first coaxial tube is determined so that the characteristic impedance on the input side of the electromagnetic wave of the first coaxial tube is higher than the characteristic impedance on the output side of the electromagnetic wave of the first coaxial waveguide. May be determined to be larger. According to this, reflection of electromagnetic waves from the plasma side can be suppressed to a small level, and a large amount of power can be transmitted to the coaxial waveguide.
  • the thickness on the input side of the inner conductor of the first coaxial waveguide is The case where it is thinner than the thickness of the output side of the inner conductor of the first coaxial waveguide is mentioned.
  • the inner conductor of the first coaxial waveguide may be continuously thickened from the input side to the output side along the longitudinal direction of the first coaxial waveguide.
  • the thickness on the input side of the outer conductor of the first coaxial waveguide may be made larger than the thickness on the output side of the outer conductor of the first coaxial waveguide.
  • the outer conductor of the first coaxial waveguide may be continuously thinned from the input side toward the output side along the longitudinal direction of the first coaxial waveguide.
  • the thickness ratio between the inner conductor and the outer conductor of the first coaxial waveguide can be changed discontinuously. May be.
  • the characteristic impedance on the input side of the first coaxial tube is 18 ⁇ to 46 ⁇
  • large power is supplied even to a thin coaxial tube. be able to.
  • the characteristic impedance on the input side of the first coaxial waveguide is limited to 22 ⁇ to 40 ⁇ , it is possible to supply larger power, which is preferable.
  • the inner conductor of the first coaxial waveguide may have a constricted portion that is partially narrowed. This is equivalent to inserting an inductance in series with the first coaxial waveguide, and it is possible to suppress reflection by optimizing the value of the inductance inserted depending on the diameter and length of the constricted portion. .
  • a dielectric ring may be provided adjacent to the dielectric plate between the inner conductor and the outer conductor of the first coaxial waveguide. This is equivalent to inserting a capacitance in parallel with the first coaxial waveguide, and it is possible to suppress reflection by optimizing the value of the inserted capacitance depending on the thickness of the dielectric ring and the dielectric constant. Become.
  • by filling the gap in the vicinity of the dielectric plate with the dielectric ring it is possible to prevent the electric field from concentrating on the adjacent portion between the first coaxial waveguide and the dielectric plate, and to prevent abnormal discharge.
  • a first dielectric support member is provided between the inner conductor and the outer conductor of the first coaxial waveguide, and the first dielectric support member is an outer periphery of the inner conductor of the first coaxial waveguide. It may be inserted into the groove formed in the. This is because the inner conductor of the first coaxial waveguide is supported by the outer conductor. Furthermore, this is equivalent to inserting a capacitance in parallel with the first coaxial waveguide, and it is possible to suppress reflection by optimizing the value of the inserted capacitance depending on the thickness of the dielectric ring and the dielectric constant. .
  • a second coaxial waveguide connected to the first coaxial waveguide and transmitting electromagnetic waves to the first coaxial waveguide, and a connection between an inner conductor of the first coaxial waveguide and an inner conductor of the second coaxial waveguide.
  • a spring member that is provided in the portion and presses the inner conductor of the first coaxial waveguide directly or indirectly to the dielectric plate via another member. According to this, transmission of electromagnetic waves is stabilized by pressing the inner conductor of the first coaxial waveguide directly or indirectly to the dielectric plate side through another member by the elastic force of the spring member. Can be made.
  • the connecting portion between the inner conductor of the first coaxial waveguide and the inner conductor of the second coaxial waveguide electrically connects the inner conductor of the first coaxial waveguide and the inner conductor of the second coaxial waveguide. You may provide the contact member to connect.
  • the inner conductor of the second coaxial waveguide may be thicker than the inner conductor of the first coaxial waveguide.
  • the connecting portion may have a play in which an angle of the inner conductor of the first coaxial waveguide is changed with respect to the inner conductor of the second coaxial waveguide. This is to facilitate the assembly of the device.
  • a second dielectric support member is provided between the inner conductor and the outer conductor of the second coaxial waveguide, and the second dielectric support member is an outer periphery of the inner conductor of the second coaxial waveguide. It may be inserted into the groove formed in the. This is because the inner conductor of the second coaxial waveguide is supported by the outer conductor.
  • a dielectric rod is provided between the inner conductor and the outer conductor of the second coaxial waveguide in the vicinity of the connecting portion, and the dielectric rod is a hole provided in the inner conductor of the second coaxial waveguide. It may be inserted in. This is because the inner conductor of the second coaxial waveguide is supported by the outer conductor.
  • the engaging portion for preventing the inner conductor of the first coaxial waveguide from dropping from the inner conductor of the second coaxial waveguide may be formed in the connecting portion.
  • the inner conductor of the first coaxial waveguide and the dielectric plate may be adjacent to each other via a metal fitting. According to this, it is possible to improve the adhesion between the inner conductor of the first coaxial waveguide and the dielectric plate by the metal fitting, and to prevent the transmission of electromagnetic waves from being disturbed.
  • the characteristic impedance of the first coaxial waveguide and the characteristic impedance of the second coaxial waveguide in the connecting portion may be equal. This is to suppress reflection of electromagnetic waves transmitted through the connecting portion.
  • a gas is introduced into a processing vessel, an electromagnetic wave is output from an electromagnetic wave source, and the thickness ratio between the inner conductor and the outer conductor is in the longitudinal direction.
  • the output electromagnetic wave is transmitted to a first coaxial waveguide having a non-uniform structure along the first, and the electromagnetic wave transmitted through the first coaxial waveguide faces the inside of the processing container and the first coaxial waveguide.
  • the characteristic impedance can be made different between the input side and the output side of the coaxial waveguide.
  • FIG. 3 is a longitudinal sectional view (2-O-O′-2 section in FIG. 2) of the microwave plasma processing apparatus according to each embodiment of the present invention.
  • FIG. 1 is a sectional view taken along the line 1-1 in FIG. It is an enlarged view of the 1st coaxial waveguide concerning a 1st embodiment, and its neighborhood.
  • FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 3.
  • FIG. 4 is a sectional view taken along line 4-4 of FIG. It is a figure for demonstrating the relationship between the ratio of the outer conductor with respect to the inner conductor of a coaxial tube, and characteristic impedance. It is a modification of the shape of the 1st coaxial pipe. It is a modification of the shape of the 1st coaxial pipe.
  • FIG. 1 is a longitudinal section of a microwave plasma processing apparatus 10 according to the present embodiment.
  • FIG. 1 shows a 2-OO′-2 cross section of FIG.
  • FIG. 2 is a ceiling surface of the apparatus 10 and shows a cross section 1-1 of FIG.
  • the microwave plasma processing apparatus 10 includes a processing container 100 for plasma processing a glass substrate (hereinafter referred to as “substrate G”).
  • the processing container 100 includes a container body 200 and a lid body 300.
  • the container body 200 has a bottomed cubic shape with an upper portion opened, and the opening is closed by a lid 300.
  • the lid body 300 includes an upper lid body 300a and a lower lid body 300b.
  • An O-ring 205 is provided on a contact surface between the container main body 200 and the lower lid body 300b, whereby the container main body 200 and the lower lid body 300b are hermetically sealed to define a processing chamber.
  • An O-ring 210 and an O-ring 215 are also provided on the contact surface between the upper lid 300a and the lower lid 300b, so that the upper lid 300a and the lower lid 300b are sealed.
  • the container body 200 and the lid body 300 are made of a metal such as an aluminum alloy, for example, and are electrically grounded.
  • a susceptor 105 (stage) for placing the substrate G is provided.
  • Susceptor 105 is made of, for example, aluminum nitride.
  • the susceptor 105 is supported by a support 110, and a baffle plate 115 for controlling the gas flow in the processing chamber to a preferable state is provided around the susceptor 105.
  • a gas exhaust pipe 120 is provided at the bottom of the processing container 100, and the gas in the processing container 100 is exhausted using a vacuum pump (not shown) provided outside the processing container 100.
  • the dielectric plate 305, the metal electrode 310, and the metal cover 320 are regularly arranged on the ceiling surface of the processing vessel 100.
  • a side cover 350 is provided around the metal electrode 310 and the metal cover 320.
  • the dielectric plate 305, the metal electrode 310, and the metal cover 320 are substantially square plates with slightly rounded corners. In addition, a rhombus may be sufficient.
  • the metal electrode 310 refers to a flat plate provided adjacent to the dielectric plate 305 so that the dielectric plate 305 is substantially uniformly exposed from the outer edge of the metal electrode 310. As a result, the dielectric plate 305 is sandwiched between the inner wall of the lid 300 and the metal electrode 310.
  • the metal electrode 310 is electrically connected to the inner wall of the processing container 100.
  • the eight dielectric plates 305 and the metal electrodes 310 are arranged at an equal pitch at a position substantially inclined by 45 ° with respect to the substrate G and the processing container 100.
  • the pitch is determined such that the diagonal length of one dielectric plate 305 is 0.9 times or more the distance between the centers of adjacent dielectric plates 305. Thereby, the slightly cut corners of the dielectric plate 305 are arranged adjacent to each other.
  • the metal electrode 310 and the metal cover 320 are thicker than the metal cover 320 by the thickness of the dielectric plate 320. According to such a shape, the height of the ceiling surface becomes substantially equal, and at the same time, the portion where the dielectric plate 305 is exposed and the shape of the recesses in the vicinity thereof all have substantially the same pattern.
  • the dielectric plate 305 is made of alumina, and the metal electrode 310, the metal cover 320, and the side cover 350 are made of an aluminum alloy.
  • the eight dielectric plates 305 and the metal electrodes 310 are arranged in four rows in two rows.
  • the present invention is not limited to this, and the increase in the number of the dielectric plates 305 and the metal electrodes 310 is also reduced. You can also.
  • the dielectric plate 305 and the metal electrode 310 are evenly supported from four locations by screws 325 (see FIG. 2).
  • a main gas flow path 330 formed in a lattice shape in a direction perpendicular to the paper surface is provided between the upper lid body 300a and the lower lid body 300b.
  • the main gas flow path 330 divides the gas into the gas flow paths 325 a provided in the plurality of screws 325.
  • a narrow tube 335 for narrowing the flow path is fitted at the inlet of the gas flow path 325a.
  • the thin tube 335 is made of ceramics or metal.
  • a gas flow path 310 a is provided between the metal electrode 310 and the dielectric plate 305.
  • a gas flow path 320 a is also provided between the metal cover 320 and the dielectric plate 305 and between the side cover 350 and the dielectric plate 305.
  • the front end surface of the screw 325 is flush with the lower surfaces of the metal electrode 310, the metal cover 320, and the side cover 350 so as not to disturb the plasma distribution.
  • the gas discharge holes 345a opened in the metal electrode 310 and the gas discharge holes 345b opened in the metal cover 320 and the side cover 350 are arranged at an equal pitch.
  • the gas output from the gas supply source 905 passes through the gas flow path 325a (branch gas flow path) from the main gas flow path 330, and the first gas flow path 310a in the metal electrode 310, the metal cover 320, and the side cover.
  • gas flow path 325a (branch gas flow path) from the main gas flow path 330, and the first gas flow path 310a in the metal electrode 310, the metal cover 320, and the side cover.
  • gas is supplied from the gas discharge holes 345a and 345b into the processing chamber.
  • An O-ring 220 is provided on the contact surface between the lower lid 300 b and the dielectric plate 305 in the vicinity of the outer periphery of the first coaxial waveguide 610, and the atmosphere in the first coaxial waveguide 610 is placed inside the processing container 100. It is designed not to enter.
  • the inner conductor 610a is inserted into the outer conductor 610b of the first coaxial waveguide formed by digging the lid 300.
  • the inner conductors 620a to 640a of the second to fourth coaxial waveguides are inserted into the outer conductors 620b to 640b of the second to fourth coaxial waveguides formed by digging in the same manner, and the upper part thereof is the lid cover. It is covered with 660.
  • the inner conductor of each coaxial tube is made of copper with good thermal conductivity.
  • the surface of the dielectric plate 305 shown in FIG. 1 is a metal film 305a except for a portion where the microwave is incident on the dielectric plate 305 from the first coaxial waveguide 610 and a portion where the microwave is emitted from the dielectric plate 305. It is covered with. Accordingly, the propagation of the microwave is not disturbed by the gap generated between the dielectric plate 305 and the adjacent member, and the microwave can be stably guided into the processing container.
  • the dielectric plate 305 is covered with the metal cover 320 and the inner wall of the processing vessel 100 in which the metal plate 310 and the dielectric plate 305 are not disposed one-on-one. (Including the inner wall of the processing container 100).
  • the dielectric plate 305 and the inner wall of the processing vessel 100 in which the dielectric plate 305 is not disposed are substantially similar in shape or substantially The shape is symmetrical. Thereby, microwave power can be supplied from the dielectric plate to the metal electrode side and the inner wall side (metal cover 320 and side cover 350 side) substantially evenly.
  • the microwave emitted from the dielectric plate 305 propagates on the surfaces of the metal electrode 310, the metal cover 320, and the side cover 350 while distributing the power in half as a surface wave.
  • the surface wave propagating between the metal surface on the inner surface of the processing vessel and the plasma is hereinafter referred to as a conductor surface wave (metal surface wave).
  • the conductor surface wave propagates to the entire ceiling surface, and uniform plasma is stably generated below the ceiling surface of the microwave plasma processing apparatus 10 according to the present embodiment.
  • the side cover 350 is formed with an octagonal groove 340 so as to surround the entire eight dielectric plates 305, and the conductor surface wave propagating on the ceiling surface is prevented from propagating outside the groove 340. To do.
  • a plurality of grooves 340 may be formed in multiple in parallel.
  • a region having the center point of the adjacent metal cover 320 around the metal electrode 310 as a center is hereinafter referred to as a cell Cel (see FIG. 1).
  • a cell Cel On the ceiling surface, a cell Cel is defined as a unit, and the configuration of the same pattern is regularly arranged in an 8-cell Cel.
  • the refrigerant supply source 910 is connected to the refrigerant pipe 910a inside the lid and the refrigerant pipe 910b of the inner conductor 640a of the fourth coaxial pipe, and the refrigerant supplied from the refrigerant supply source 910 passes through the refrigerant pipes 910a and 910b. By circulating and returning to the refrigerant supply source 910 again, heating of the lid 300 and the inner conductor is suppressed.
  • FIG. 3 is a cross-sectional view of the first and second coaxial waveguides 610 and 620 and a connecting portion Dc thereof.
  • FIG. 4 is a 3-3 cross section of FIG.
  • FIG. 5 is a 4-4 cross section of FIG.
  • the first coaxial waveguide 610 is formed of the inner conductor 610a and the outer conductor 610b.
  • the second coaxial waveguide 620 is formed of an inner conductor 620a and an outer conductor 620b.
  • the inner conductors of the first and second coaxial waveguides 610 and 620 are both made of copper.
  • the outer conductors 610b and 620b are defined by the dug formed in the lid 300 and the lid cover 660.
  • the first coaxial waveguide 610 and the second coaxial waveguide 620 are connected substantially vertically at the connection portion Dc.
  • a rod 610a1 formed at the tip of the inner conductor 610a of the first coaxial tube is fitted in a bottomed vertical hole 620a1 formed in the lower surface of the second coaxial tube.
  • a dielectric ring 710 (an example of a first dielectric support member) is fitted into a groove 610a2 formed on the outer periphery of the inner conductor 610a of the first coaxial waveguide, whereby the inner conductor 610a is inserted into the outer conductor 610b.
  • the inner conductor 610a is supported to prevent the shaft from shaking.
  • a dielectric ring 715 (an example of a second dielectric support member) is also inserted into a groove 620a2 formed on the outer periphery of the inner conductor 620a of the second coaxial waveguide, whereby the inner conductor 620a is inserted into the outer conductor 620b. It comes to support.
  • the dielectric rings 710 and 715 are made of, for example, Teflon (registered trademark).
  • the inner conductor 620a of the second coaxial waveguide is also supported from the side by a dielectric rod 720.
  • the dielectric rod 720 is inserted into the bottomed horizontal hole 620a3 provided in the inner conductor 620a of the second coaxial waveguide, and is inserted through the horizontal hole provided in the rod 610a1 to the bottom of the horizontal hole 620a3.
  • the inner conductor 610a of the first coaxial waveguide is fixed to the inner conductor 620a of the second coaxial waveguide 620 by the dielectric rod 720.
  • the inner conductor 610a of the first coaxial waveguide and the inner conductor 620a of the second coaxial waveguide are connected to the digging formed in the lid 300. Because it can, it is easy to install.
  • the inner conductors 610a and 620a of the first and second coaxial waveguides are connected and fixed without using screws, and the inner conductor 610a of the first coaxial waveguide is dropped from the inner conductor 620a of the second coaxial waveguide. Can be prevented.
  • the dielectric rod 720 is an example of an engaging portion for preventing the inner conductor 610a of the first coaxial waveguide from dropping from the inner conductor 620a of the second coaxial waveguide.
  • the horizontal hole provided in the rod 610a1 is a long and long hole, and the inner conductor 610a of the first coaxial waveguide can be moved up and down somewhat. Thereby, the internal conductor 610a and the dielectric plate 305 can be reliably brought into contact. Furthermore, there is a gap between the vertical hole 620a1 of the second coaxial waveguide and the rod 610a1, so that the angle of the inner conductor 610a of the first coaxial waveguide can be slightly changed with respect to the internal conductor 620a.
  • a flat surface is provided at a contact portion with the inner conductor 610a of the first coaxial waveguide, and the inner conductors 610a and 620a are electrically connected by the shield spiral 705. It is designed to be connected securely. Further, by pressing the inner conductor 610a of the first coaxial waveguide against the dielectric plate 305 due to the elastic force of the shield spiral, a gap is opened between the inner conductor 610a of the first coaxial waveguide and the dielectric plate 305. Is preventing.
  • the shield spiral 705 is an example of a contact member that electrically connects the inner conductor 610a of the first coaxial waveguide and the inner conductor 620a of the second coaxial waveguide, and the inner conductor 610a of the first coaxial waveguide is connected to the shield spiral 705. It is an example of the spring member pressed against the dielectric plate 305.
  • connection portion between the inner conductor 610a of the first coaxial waveguide and the inner conductor 620a of the second coaxial waveguide is electrically connected at a portion as close as possible to the outer peripheral surface of each inner conductor. This is because if the electrical connection is made in the interior away from the outer peripheral surface, an unstable reactance component is added due to a partial gap generated between the internal conductors, and reflection occurs.
  • the flat surface of the lower portion of the inner conductor 620a of the second coaxial waveguide becomes the outer peripheral surface.
  • the shield spiral 705 is electrically connected at a portion close to the outer peripheral surface.
  • the front end of the inner conductor 610a of the first coaxial waveguide is in contact with a recess 305a formed on the dielectric plate 305 with a disk-shaped metal fitting 725 formed of copper interposed therebetween.
  • the metal fitting 725 By using the metal fitting 725, the adhesion between the inner conductor 610a of the first coaxial waveguide and the dielectric plate 305 can be enhanced.
  • the outer conductors 610b and 620b of the first and second coaxial waveguides are formed by digging the lid 300 from above. For this reason, the upper part of the outer conductor 620b of the second coaxial waveguide shown in FIG.
  • the concentration of the electric field is suppressed and abnormal discharge is prevented.
  • the end portion of the outer conductor 610 b protrudes above the second coaxial waveguide 620 by providing a recess on the lower surface of the lid cover 660.
  • the shape of the outer conductor 620b of the second coaxial waveguide is enlarged so that a wide space is provided between the inner conductors 610a and 620a and the outer conductors 610b and 620b of the first and second coaxial waveguides. Is provided. In this way, when the microwave is transmitted from the second coaxial waveguide 620 to the first coaxial waveguide 610, the coupling portion Dc is designed to prevent reflection.
  • the thickness ratio between the inner conductor 610a and the outer conductor 610b is not uniform along the longitudinal direction.
  • thickness of (diameter B) is continuously toward the output side from the input side of the microwave in the longitudinal direction (gradually) becomes narrower (B 1> B 2).
  • the inner conductor 610a and the outer conductor 610b on the side where microwaves are input to the first coaxial waveguide (the input side of the inner conductor 610a of the first coaxial waveguide, hereinafter also simply referred to as the input side)
  • the ratio of the diameters B 1 / A 1 and the side from which the microwaves are output from the inner conductor 610a of the first coaxial waveguide (the output side of the inner conductor 610a of the first coaxial waveguide, hereinafter also simply referred to as the output side).
  • the ratio of the diameter ratio B 2 / A 2 between the inner conductor 610a and the outer conductor 610b is B 1 / A 1 > B 2 / A 2 .
  • the equation (1) the relationship between the characteristic impedance Z c2 of the first coaxial waveguide 610 having a characteristic impedance Z c1 and the output side of the first coaxial waveguide 610 on the input side, a Z c1> Z c2 .
  • the first coaxial tube 610 has a thickness ratio between the inner conductor 610a and the outer conductor 610b that is different between the input side and the output side of the first coaxial tube 610, thereby The characteristic impedance of the coaxial tube 610 is changed.
  • the characteristic impedance of the first coaxial waveguide 610 is gradually reduced by gradually reducing the thickness of the outer conductor 610b. Thereby, reflection can be made difficult to occur.
  • the diameters of the inner conductor 610a and the outer conductor 610b are adjusted so that the characteristic impedance on the input side of the first coaxial waveguide 610 is 30 ⁇ and the characteristic impedance on the output side of the first coaxial waveguide 610 is 15 ⁇ .
  • the output side of the first coaxial waveguide is referred to as a 15 ⁇ low characteristic impedance line
  • the input side of the first coaxial tube is referred to as a 30 ⁇ high characteristic impedance line
  • the low characteristic impedance line and the high characteristic impedance line are How to connect is explained.
  • the thickness (diameter B) of the outer conductor 610b of the first coaxial waveguide is continuously (gradually) decreased along the longitudinal direction toward the microwave output side, and the thickness of the inner conductor 610a is decreased.
  • (Diameter A) is made uniform along the longitudinal direction.
  • the thickness (diameter B) of the outer conductor 610b of the first coaxial waveguide is made uniform along the longitudinal direction, and the thickness (diameter A) of the inner conductor 610a is microwaved along the longitudinal direction. It may be thickened continuously (gradually) toward the output side.
  • the internal conductor 610a is provided with a step 610a6, or the external conductor If the length of the low characteristic impedance line is adjusted so that the impedance when the low characteristic impedance line side is seen from the step part 610a6 is closest to the characteristic impedance of the high characteristic impedance line, Can be minimized.
  • the reflection coefficient seen from the step portion 610a6 toward the low characteristic impedance line rotates clockwise on the complex plane (on the Smith chart) of FIG. 9 when the length of the low characteristic impedance line is increased. If the length of the low characteristic impedance line is adjusted so that the reflection coefficient becomes a positive real number (so that it is at the right end on the complex plane), the impedance viewed from the step 610a6 toward the low characteristic impedance line side is from the impedance Zd. The real number is adjusted to the maximum impedance Zm, and the reflection can be minimized.
  • the impedance viewed from the step portion 610a6 on the low characteristic impedance line side can be matched with the characteristic impedance of the high characteristic impedance line, non-reflection can be achieved.
  • the reflection coefficient rotates once on the Smith chart, so that the length of the low characteristic impedance line is not more than ⁇ g / 2.
  • the length of the low characteristic impedance line is ⁇ g / 4.
  • the metal fitting 725 and the shield spiral 740 are not provided at the end of the internal conductor 610a, and the internal conductor 610a and the metal film 305a in the depression of the dielectric plate are in direct contact.
  • the constricted portion 610a3 is not provided in the inner conductor 610a.
  • the metal fitting 725 is not provided, and the shield spiral 740 is in direct contact with the metal film 305a in the depression of the dielectric plate. Further, as shown in FIG. 8, when there is a stepped portion 610a, the inner conductor 610a and the outer conductor 610b are not tapered.
  • the characteristic impedance on the input side of the first coaxial tube may be any value in the range of 18 ⁇ to 46 ⁇ , and more preferably 22 ⁇ . Any value in the range of ⁇ 40 ⁇ is good. The reason is explained.
  • the gas flow path must be provided at a position that does not interfere with the first coaxial waveguide or the like. For this reason, the thickness of the first coaxial waveguide 610 cannot be made too thick.
  • microwaves of several hundred watts to several kW must be transmitted to the first coaxial waveguide 610, so that the current density of the inner conductor 610a of the first coaxial waveguide is increased and heating is performed. There is a problem that will be done.
  • the dielectric ring 710 or the like holding the inner conductor 610a is deformed or deteriorated, the surface of the inner conductor is oxidized, or the inner conductor 610a extends to each part. There is a risk of damage due to stress.
  • Emax is the maximum electric field (electric field on the inner conductor surface) in the coaxial waveguide, and is proportional to the rising temperature of the inner conductor.
  • Fig. 12 shows the relationship between Pmax and characteristic impedance from the above equation.
  • the vertical axis represents the standardized maximum transmission power when the inner diameter of the outer conductor is constant. It can be seen that the maximum transmission power becomes maximum when the characteristic impedance is 30 ⁇ .
  • the characteristic impedance (on the input side) of the first coaxial waveguide may be set to 18 to 46 ⁇ , and more preferably 95% or more is transmitted. Therefore, it should be 22 to 40 ⁇ .
  • the inner conductor 610a of the first coaxial waveguide has a constricted portion 610a3 that is partially narrowed.
  • the constricted portion 610a3 is a series inductance having an arbitrary size determined by its diameter and length.
  • the dielectric ring 710 is a parallel capacitance of an arbitrary size determined by its thickness and dielectric constant.
  • FIG. 10 is a diagram corresponding to FIG. 3 used when describing the first embodiment.
  • the second embodiment is different from the first embodiment mainly in the configuration of the connecting portion Dc and in that a dielectric ring is provided in the vicinity of the dielectric plate. Therefore, below, it demonstrates centering on this difference, and abbreviate
  • the dielectric rod 720 is inserted into the horizontal hole 620a3 of the inner conductor 620a of the second coaxial waveguide, whereby the inner conductor 620a is supported by the outer conductor 620b.
  • the dielectric rod 720 since the dielectric rod 720 does not penetrate the inner conductor 610a of the first coaxial waveguide, it does not have a function of preventing the inner conductor 610a from falling off.
  • the lower portion of the vertical hole 620a1 of the inner conductor 620a of the second coaxial waveguide is threaded, and the head portion of the rod 610a1 at the end of the inner conductor 610a is also threaded.
  • the upper part of the vertical hole 620a1 is not threaded, and the hole diameter is larger than the outer diameter of the rod 610a1. For this reason, the rod 610a1 is fixed to the vertical hole 620a1 by screwing the head of the rod 610a1 into the vertical hole 620a1 and screwing the threaded portion at the end of the rod 610a1 with the unthreaded portion above the vertical hole 620a1. .
  • the inner conductor 610a of the first coaxial waveguide can be fixed in a freely movable state while preventing the inner conductor 610a of the first coaxial waveguide from falling off.
  • the internal conductor 610a of the first coaxial waveguide is dropped from the internal conductor 620a of the second coaxial waveguide. It is an example of the engaging part for preventing.
  • a recess 610a4 is formed at the connecting portion Dc, and a metal spring 730 is provided inside the recess 610a4.
  • the metal spring 730 is an example of a spring member that presses the inner conductor 610 a of the first coaxial waveguide against the dielectric plate 305.
  • the end portion of the inner conductor 610a of the first coaxial waveguide is inserted into a recess provided in the lower portion of the inner conductor 620a of the second coaxial waveguide.
  • a shield spiral 705 is provided on the contact surface of the internal conductors 610a and 620a.
  • the shield spiral 705 is an example of a contact member that electrically connects the internal conductors 610a and 620a.
  • a dielectric ring 735 is attached between the inner conductor 610a and the outer conductor 610b of the first coaxial waveguide adjacent to the dielectric plate 305. According to this, abnormal electric discharge can be prevented by covering the strong electric field part of the adjacent part of the first coaxial waveguide 610 and the dielectric plate 305 with the dielectric.
  • the metal film 305a is not provided on the contact surface between the metal fitting 725 and the dielectric plate 305 (the recessed portion of the dielectric plate 305).
  • FIG. 11 is a diagram corresponding to FIG. 3 used for the description of the first embodiment and FIG. 10 used for the description of the second embodiment.
  • the structure of the connection part Dc differs from 2nd Embodiment. Therefore, below, it demonstrates centering on this difference, and abbreviate
  • a recess 610a4 is formed on the outer periphery of the rod 610a1 of the internal conductor 610a, and the outer side thereof is a leaf spring 610a5. There is no shield spiral at the engaging portion.
  • the leaf spring 610a5 is an example of a contact member that electrically connects the internal conductors 610a and 620a.
  • a metal spring 730 is provided in the recess 610a4 of the inner conductor 610a of the first coaxial waveguide, and the inner conductor 610a of the first coaxial waveguide is connected to the dielectric plate by the elastic force of the metallic spring 730 (an example of a spring member). Press against 305 to adhere.
  • the microwave source 900 that outputs a 915 MHz microwave is described, but a microwave source that outputs a microwave such as 896 MHz, 922 MHz, and 2.45 GHz may be used.
  • the microwave source is an example of an electromagnetic wave source that generates an electromagnetic wave for exciting plasma, and includes a magnetron and a high-frequency power source as long as the electromagnetic wave source outputs an electromagnetic wave of 100 MHz or higher.
  • the shape of the metal electrode 310 is not limited to a quadrangular shape, and may be a triangular shape, a hexagonal shape, or an octagonal shape.
  • the shape of the dielectric plate 305 and the metal cover 320 is the same as the shape of the metal electrode 310.
  • the metal cover 320 and the side cover may or may not be present.
  • a gas flow path is formed directly in the lid 300.
  • there may be no gas discharge hole, no gas discharge function, or a lower shower may be provided.
  • the number of metal electrodes 310 and dielectric plates 305 is not limited to eight, and may be one or more.
  • the gap between the dielectric plate 305 and the lid 300 and between the dielectric plate 305 and the metal electrode 310 is preferably 0.2 mm or less. The reason will be explained. When discharge occurs in the gap between the dielectric plate 305 and the adjacent metal surface, the energy of plasma microwave is lost, the plasma excitation efficiency is remarkably deteriorated, and the dielectric 305 and the metal electrode 310 are damaged. . If the gap is smaller than the mean free path of electrons, the distance is reduced, so that the electrons collide with the wall before obtaining energy necessary for ionization from the microwave electric field and lose energy.
  • the diameter of the gas flow path should be set to such a size that does not discharge even in a situation where it is most likely to be discharged under actual use conditions.
  • ua is the average velocity of electrons
  • ⁇ c is the collision frequency of electrons.
  • k is a Boltzmann constant
  • T is an electron temperature
  • the microwave frequency 915 MHz
  • the mean free path at this time is calculated from the above equation, it is 0.20 mm. That is, if the diameter of the gas flow path is 0.2 mm or less, stable plasma can always be excited without discharging in the gap.
  • the plasma processing apparatus is not limited to the above-described microwave plasma processing apparatus, and may be any apparatus that finely processes an object to be processed by plasma, such as a film forming process, a diffusion process, an etching process, an ashing process, and a plasma doping process.
  • the plasma processing apparatus can process a large area glass substrate, a circular silicon wafer, and a square SOI (Silicon On Insulator) substrate.
  • a large area glass substrate a circular silicon wafer, and a square SOI (Silicon On Insulator) substrate.
  • Microwave plasma processing apparatus 100 Processing container 200
  • Container main body 300
  • Lid body 300a Upper lid body 300b
  • Lower lid body 305
  • Dielectric board 305a
  • Metal film 310
  • Metal electrode 320
  • Metal cover 325
  • Screw 330
  • Main gas flow path 335 Narrow tube 350
  • Side cover 610
  • First 1 coaxial tube 620
  • 2nd coaxial tube 705 740 Shield spiral 710, 715, 735 Dielectric ring
  • Metal fitting 900
  • Microwave source 905
  • Gas supply source 910
  • Refrigerant supply source Cel Unit cell Dc Connecting portion

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Plasma Technology (AREA)
PCT/JP2009/060158 2008-06-11 2009-06-03 プラズマ処理装置及びプラズマ処理方法 Ceased WO2009150978A1 (ja)

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KR1020107022951A KR101229843B1 (ko) 2008-06-11 2009-06-03 플라즈마 처리 장치
CN2009801212828A CN102057760A (zh) 2008-06-11 2009-06-03 等离子体处理装置及等离子体处理方法

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CN102057760A (zh) 2011-05-11
JP5421551B2 (ja) 2014-02-19
US8327796B2 (en) 2012-12-11
JP2009301807A (ja) 2009-12-24
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